Non-repeating safety-clutch.



C. SHERMAN.

NON-REPEATING SAFETY CLUTCH.

APPLICATION'FILED SEPT. 8. 1916.

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I SHERMAN.

NON-REPEATING SAFETY CLUTCH.

APPLICATION FILED SEPT 8. 1916.

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ATTORNEYS.

Les

CEAELES SHEEMM, OFKEAYWQGD, ILLINQIS.

fiQhi-EEPEATIIEG SAFETY-CLUTGHQ essor a Specification of Letters Patent.

, Patented May 2%, ihil'i.

Application filed Septcrnhcr 8, 1916.. Serial 16 o. 118,98t.

To all whom it may concern." I

Be it known that I, GHARLEs SHERMAN, a citizen of the United. States, and a resident of Maj wood, in the county of Cook and State of Illinois, have invented new and useful improvements in non-repeating safety-clutches for use in machines having ousl Mi? invention is easily understood by reference to the accompanying drawing in which the reference numerals indicate the same parts in the various views.

Figure l is the front view of a punch press.

shown as a convenient machine with which to illustrate my non-repeating safety clutch and it is understood that I do not include any of the features of this machine except the trip latch to which I connect my device. Fig. 2. is the left elevation of the same machine showing the parts of my device. Fig.

3 is the rightelevationof the punch press with my device attached. Fig.4: is my assembled clutch showing the position of the operating pawl. Fig. is a side view of lever with the disks showing the cutaway portions "together with the tension spring and chain connection to the. trip latch. Fig. Sis a side View of my left trip handle.- Fig. 7 is a top view of myleft trip handle. Fig. 8 is a side view of my disks 1 showing the locking pin in the raised position.

Referring now to parts, the numeral 2 is the fly wheel of a punch press, 3 the crank shaft, 4; the crank shaft connection, 5 the cross head, 6 the driving clutch of: the machine, 7 the trip latch of the driving clutch 6 -by means of wh'ch the members or driving clutch 6 are kept from engagement, 8

is the usual. flexible connection from the trip latch and in this case leads to my trip lever 9, 10 is the right trip handle whose hub 13 is the disk of my safety clutch which. carries the operating pawl 14, 11 is the trip handle returning spr1ng,'12 is a sprlng to absorb the shock of latch 7 as actuated by spring 16, and also to prevent trip lever 9 from too great travel, 15 is a tension sprin for operating pawl 14, 17 is the rock shait of my device to which are fixed cams iii-18. Referring to Fig. 5, pin 19 of the operating awl 14c rides the cams 1818. lQoggle mem ers 20-21 with spring hinge 22 constitute the left trip handle.

which islfixed on rock shaft 17 for the purpose of rotating cams 18-18, 23-23 are the movement limiting guards of trip handles 10 and 20, 2i are screws for accurately limiting the movement of .trip handles 10 and 20, 25 is acontrolling cam on shaft 3 upon which rides roller 26 of lever 27 piV otcd at 28 and long link 29 pivoted at 30 and carrying the hinge pin 22 for the un pose of restoring 21 together withsha t 17 and cams 1818, and 32 is a tension spring for hinge 22. l

In operation the work is placed in position. Then trip handles 10 and 20 are depressed. It will be remembered that trip handle 20 rotates cams 18-18 to allow pin 19 to ride in their cutaway portions so that pin 19 operated by trip handle 10 may engage shoulder 33 of trip lever 9 and thus depress 9 and through connection 8 withdraw latch 7 to allow the-membersof clutch 6 to engage for the purpose of causing one complete cycle. During this cycle, cam 25v through roller 26, lever. 27 and link 29 re-:- stores section 21 of lever 20, whether lever section 20 be allowed to restore or be held down because of my spring hinge with ten-. sion spring 32 as shown in Fig. 2. This spring hinge also prevents shock to the hands if the lever 20 be not released romptly by the hand.- It will he rememered that this action of section 21 movcs the rock shaft 17 so that cams 18--18 hold awl 14 out of engagement with shoulder 33,

1n fact they raise it out of engagement so that latch lever 9 is allowed to rise which ermits latch 7 to disengage the clutch memers of clutch it Pawl 14 being thrown out of engagement by cams. 18 -18 cannot reengage shoulder 33 until handle 18 is allowed to rise to bring pin 19 into the cutaway portions of 18-18 so as to allow. pin 19 to drop into the path of shoulder 33 so that if both 10 and 20 be depressed to retain the registration of the cutaway portions of Q 1,228,0'ifd l818 with pin 19 the latch lever 9 will be again depressed. to withdraw latch 7 to cause a new cycle. It will be seen that by no manipulation of the handles can the operator cause more than one cycle WltllOllt.

himself allowing the handle 10 to return to normal position and then to advance it'as before. It will also be appreciated that there is no necessary time limit for the release of the handles to prevent repetition with its risks since the operator may hold both handles down or either one of them without in any way affecting the completion of the cycle and the prevention of another cycle except in the regular way. Spring 12 serves the double purpose of absorbing the shock of lever 9 upon handle 10 and also to limit the upward travel of 9 so as to keep shoulder 33in position to engage pin 19.

It often occurs that the work requires the hands to hold itso that a foot lever is necessary. l have refrained from mention of my means to care for this use in order to avoid confusion. By reference to Fig. 2 it will be seen that lever 20 has a slot 36 with locking pin 37 by which lever 20 may be locked down. Pedal 34: is connected to lever 10 by chain 35. Fig. 1 shows the punch press on the last quarter turn of its crank shaft 3 so that. earn 25 has already caused 21 to rise thus forcin cams 1818 under pin 19 o release shoulder 33 of lever 9 and although 20 is held in the depressed position it'is impossible to secure another operation until 10 is raised to bring pin 19 into cuta- Way portions of 18-18 so that it may again engage shoulder 33.

It will be seen that I get full non-repeating results either with hand or pedal action tripping mechanism therefor, levers on each side of said machine, a shaft connecting said levers, a serles of disks with cutaway portions upon said shaft one part of said disk series being controlled by each of said levers, an operating pawl pivoted upon one of these disks and adapted to fall into the cutaway portions of said disks when the said levers move in unison, a restoring mechanism consisting of a cam with connections to forcibly restore the mechanism to normal position.

2. In machines of the class described, the combination of the driving clutch and the tripping mechanism therefor, levers on each side of said machine, a shaft connect ing said levers, a series of disks with cutaway portions upon said shaft one part of said disk series being controlled byeach of said levers, an operating pawl pivoted upon one of these disks and adapted to fall into the cutaway portions of said disks when the said levers move in unison, a restoring mechanism consisting of a cam with connections to forcibly restore the mechanism to normal position, a spring hinge in one of said levers, means for locking one of said levers, a pedal with connection to the other of said levers.

CHARLES SHERMAN.

Witnesses A. M. MAIN, F. F. MAIN. 

